General preferences are basic settings in Final Cut Pro.
Time Display: Use this pop-up menu to choose the time mode for Final Cut Pro. Changes in this setting affect the time display (for the position of the skimmer or the playhead) in the Dashboard in the center of the toolbar, as well as trimming and navigation operations in Final Cut Pro. You have the following options:
Timecode display including subframes
Duration in frames
Duration in seconds
Reset All: Click this button to reset all warning dialogs that you dismissed by selecting the “Do not remind me again” checkbox.